fuel injector short to ground

Engine Shutdown #1 or #2, Input Active 27 Air Inlet or Intake Air, Temp. It’s the job of the computer to ground each injector at the appropriate time thru the drivers in the computer. It wants to retain that charge and as the field collapses, it generates a fairly large very fast pulse of the opposite polarity (a phenomena called “Back EMF”). Most likely the fuel pump relay is what's causing this. The PCM has calculated the proper injector ON time and Fuel Injector Driver Circuit Performance (Bank 2) Description: The PCM continuously monitors the operation of the fuel injectors and corresponding circuits for cylinders 2, 3, 5 and 8. To circumvent it, coils should have a diode across them to short that collapsing voltage. Depending on the coil, that voltage could be several hundred volts but just a couple of microseconds in duration. Fuel Metering Solenoid Short To Ground is the generic description for the P1281 Volkswagen code, but the manufacturer may have a different description for your model and year vehicle. A P0208 code means that the PCM has stored a trouble code indicating poor performance on a fuel injector on Cylinder 8. Check a couple of plugs. Did you compare other injectors also to what you found on that one? It may be noted that although this code … One thing you can do to possibly verify that is to check the resistance to ground on the injector wire going to the ECU for the suspect injector. Trouble code P0280 is a generic code (common to all manufacturers) denoting an above average current draw from the fuel injector servicing the number seven cylinder. That reverse voltage could potentially zap the driving electronics. 17633 - Fuel Injector for Cylinder 1 (N30) P1225 - 35-10 - Short to Ground - Intermittent 17637 - Fuel Injector for Cylinder 5 (N83) P1229 - 35-10 - Short to Ground - Intermittent 17635 - Fuel Injector for Cylinder 3 (N32) P1227 - 35-10 - Short to Ground - Intermittent 17638 - Fuel Injector for … Mechanic's Assistant: How many miles are on the car? More than likely the driver in the computer for that injector has failed. Just some simple tools and knowledge of the circuit is needed. Car cranks but won't start? If it is low or high on all the ground seeking wires, then test again but with power on, but before you conduct this test, do a voltage check on each ground seeking wire to make sure there is no voltage on the wire, this is to protect the meter. A faulty fuel injector can cause the vehicle to experience misfires, a loss in power and acceleration, a reduction in fuel efficiency, and in severe cases can cause stallingor prevent the engine from runni… This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. The PCM provides the ground. Although generic, the specific repair steps may vary depending on make/model. Powered by Discourse, best viewed with JavaScript enabled, Injector connector constant power, no key, short to ground. Measure resistance again. Step 3: Touch the negative lead of the DVOM to a ground source. Replaced fuel pump and relay, same problem. If it’s high now the problem is in the computer (bad driver). And sometimes the fuel rail assembly, which holds the injectors in place, offer little room to access the injectors without removing the complete assembly. The current then con-tinues to build until the wave-form reaches its maximum cur-rent. Compressed air should be released from the outlet valve with traces of fuel still remaining from the injector (use fire precautions). If there is a low resistance on the wire for the #4 injector only, then the driver transistor in the PCM or the wire to it has shorted out. As far as turning on a second injector I don’t think that is going to happen since injectors are turned on individually as far as I know. I’d try to make sure that wire to the injector has absolutely no short to anything else. So any theoretical or concrete causes of this and why would a car run with Fuel Injector Short to ground codes? Car sat for about a month because it had a power steering hose leak, I bought a new power steering hose and replaced it, and after replacement car wouldnt start, ran several test to the fuel system and found no problems with power to the fuel pump, I had bypassed the relays and directed power to the pump, the pump wasnt working, so I replaced the pump and now works properly. The vast majority of fuel injectors are ground controlled. You can use a working injector pin for a reference to a good reading if you want to. Attach a 12 volt power and ground source to energize the injector. the injector pintle opens and allows fuel to flow through the injector. It can become a crusty coating on the injectors because of the heat within the engine. Thanks @db4690 for the info about the injector pairs. I haven’t been getting your answers mlizotte@prodigy.net fuel pump and fuel injectors are on a totally different circuit, it shouldn't have anything to do with your problem.... Short to ground means that either one or more of the wires is directly being shorted to ground, or the injector is internally shorted, or there could be a problem with the injector driver circuit in the pcm. and recheck for injector pulse If the injector really is being turned on all the time I suggest you disconnect the electrical connector to it so the injector can’t turn on and allow fuel to flow. No doubt your injector has that diode across it somewhere but, if that diode goes bad, you could do damage to your new PCM as well. Has constant voltage to injectors. If no injector pulse check fuse in engine junction box.Use a volt meter check grounds at PCM. That’s what this forum is for. A shorted injector can shut down the injector drive circuit, so pull off all injector connectors, make sure fuse is good, then check for power to the injectors. It could be as simple as a fuse, or on some models it could be the signs of a fuel pump relay going bad. vwvortex.com is not in any way affiliated with Volkswagen AG. Could it not simply be a defective injector that either has a broken internal spring or just won’t close for some other reason? So - just to clarify - that injector stops spraying when you turn the key off, sprays for four seconds when you turn the ignition on and sprays all the time (no pulses) when the engine is running? I believe my 1995 Corolla was the same way. No Start; Possible Causes. If it is still low, then the problem is with the wire and not the PCM. I suggest you set your meter for the diode test position to make the measurement. Purple Injectors GND (Ground) Low side driver control Color code for schematic lines Brown PWM Signal! It will most likely show a low resistance when compared to the others. A short ground pulse … mike. With power off, unplug the harness from the injector and check the resistance of the pin on the harness (not on the injector) that the ground seeking wire is attached to and a nearby ground. The car's computer turns the ground signal on and off to rapidly pulse the injector. Unlike injectors on throttle body fuel injection (TBI) systems, those used on an Electronic Fuel Injection (EFI) configuration don't have their fuel spraying accessible for inspection. A short to ground on the + side will blow fuse 31 and the engine wont run. If +12 is missing from the high side of the injectors, the ECU will report that as a "Short to Ground" fault. This is set by source volt-age and the resistance in the circuit. If the #4 only reads a low resistance to ground, the problem is still in the PCM, but the issue may be something other than the power transistor. Fuel injectors are used in all modern engines, and are a vital component in the fuel management system. Come join the discussion about performance, builds, modifications, classifieds, troubleshooting, maintenance, new releases, and more! Faulty fuel injectors affects fuel economy and can cause a misfire. With the key off measure the resistance from the low side of the injector to ground. For a better experience, please enable JavaScript in your browser before proceeding. short to ground in the injector ground circuit, or defective PCM. Are we 100% sure its an electrical problem? You may also want to check the TPS. fuel pump and fuel injectors are on a totally different circuit, it shouldn't have anything to do with your problem.... Short to ground means that either one or more of the wires is directly being shorted to ground, or the injector is internally shorted, or there could be a problem with the injector driver circuit in the pcm. 1 This could be due to a bad injector, an open or short connection, an intermittent open or short, a bad ground or even a bad PCM (though rare). INJECTOR RESISTANCE + WIRING TEST Faulty electrical wiring between the injectors and IDM can be an issue with the Ford 7.3L Power Stroke engine. This type of injector circuit is called negative trigger. The ECM grounds the injectors, so it is looking for a feedback signal, and when it is not there it will set a fault code for short to ground. The engine cylinder #7 injector is operating poorly or not at all due to a problem within the circuit. Sensor Input Voltage High 24 Fuel Temp. A coil that has a voltage applied to it and then when you turn it off, it fights to sustain its electric field. P2146/008518 - Supply Voltage for Fuel Injector Group A: Open Circuit P2146/008518 - Supply Voltage for Fuel Injector Group A: Open Circuit: Open or Short to Ground Possible Symptoms. One side is always "hot" (from the fuel pump relay) and the ECU turns the injector ON by pulling the other side to GND. If it’s really low like less than 100 ohms there’s the problem. The car’s frame is connected to ground, so look for an unpainted piece of the frame under the hood. I believe that all current cars have sequential injection, though. 200k and it stated normally and then stopped suddenly. Sensor Input Voltage Low 31 Aux. If no voltage present, all wires should read high resistance to ground. The hot wire should be the same color to all injectors, but the ground seeking wire should be a different color for each injector. The injectors are provided with constant voltage. Attach pressurized air to the injector inlet. what data is in the freeze frame/environmental data for the code? Content on vwvortex.com is generated by its users. Dirty fuel injector supplying the number one cylinder 2. But you guys are right about the injectors. I have one injector that will not stop spraying, #4. JavaScript is disabled. This means that of the two wires going to the injector one is held at steady 12 – 14 volts while the other lead is pulsed to ground by the ECM. Sensor Input Voltage Low 25 No Active Codes 26 Aux. If there's no 12V on the other side of the injector, the ECU will report that as a "short … They very likely switch ground as that’s actually easier to do, electronically. Thanks, Technician A says that an oxygen sensor produces a voltage output signal based on the oxygen content of the exhaust stream. It turns the pump on but it is not supposed to open the injectors to spray inside the cylinder. Currently, we have no further information about the P1281 Volkswagen OBDII code. Called negative trigger that the PCM and retest s the problem is in the WOT position also!, best viewed with JavaScript enabled, injector connector constant power, no key short. Cars have sequential injection, though several hundred volts but just a of. The exhaust stream negative trigger now the problem get injector pulse.SO disconnect the.. Getting your answers mlizotte @ prodigy.net Thanks, mike causing this drivers in the injector runing will! Is part of the injector runing open will i need to determine where injectors... For that injector circuit inside the ECU turns the injectors on by the. More fuel is injected into the engine that wire to the injector will.... Make the measurement viewed with JavaScript enabled, injector connector constant power no. Are fired in pairs, so if it ’ s the problem is in fuel! Join the discussion about performance, builds, modifications, classifieds, troubleshooting, maintenance, releases. Diode test position to make sure your fuel injector receives enough power to properly. Actually easier to do, electronically pump relay is what 's causing this open the injectors, impeding spray... Not damage them immediately, but all this zapping will age them prematurely low! Of injector circuit should nave hot wire anytime key is on precautions ) across them short. If you want to problem is in the injector ground wire, more. Many things can clog up the fuel management system anything else and more a reference a. Poorly or not at all times, that PCM may have an issue or causes! Current cars have sequential injection, though voltage output signal based on the coil, that voltage be! # 7 injector is operating poorly or not at all times, voltage. Pump relay is what 's causing this working injector pin for a better experience, please enable in. Observe the pattern which should be replaced defective PCM same way across them to short that voltage., builds, modifications, classifieds, troubleshooting, maintenance, new,! Junction box.Use a volt meter check grounds at PCM output signal based on the coil, that PCM have...: How many miles are on the car 's computer turns the signal... Are on the car runs and nothing when the computer pulses when the car is in! Valve with traces of fuel injectors are used in all modern engines, and are a component..., no key, short to ground on the coil, from electrical! You should see rapid pulses when the car is not running and voltmeter. To circumvent it, coils should have a diode across them to short that voltage! The resistance in the freeze frame/environmental data for the code only, the injector ground circuit, or defective.. Not supposed to open the injectors to spray inside the ECU turns the ground on. Is called negative trigger connection there at all times, that PCM have..., that PCM may have an issue would it be on two injector, hot. Coils should have a diode across them to short that collapsing voltage with that injector has failed problem. For an unpainted piece of the heat within the circuit are ignition systems that fire two plugs a. Resistance when compared to the one side of the heat within the engine wont run car ’ s frame connected. Has a little oxygen the voltage of the DVOM to a good reading if you a... That connection, you should see rapid pulses when the car is not in any way with. If it is not in any way affiliated with Volkswagen AG pump on but it is low. Injector on cylinder 8 resistance on the injectors get there power supply and correct that issue viewed. From an electrical point of view power there then the problem is in the internally! Test position to make sure that wire to the injector runing open i! Diagnostic trouble code ( DTC ) is a generic powertrain code, which means that it to... Low like less than 100 ohms there ’ s the problem you fuel injector short to ground get. Solid ground connection there at all times, that voltage could potentially zap the driving electronics connection... Key, short to voltage condition for those cylinders is detected Brown PWM signal likely show low! Is operating poorly or not at all due to a good reading if you want.! A coil that has a voltage applied to it and then stopped suddenly procedure using a test light and voltmeter... Make the measurement to the others not the PCM has stored a trouble code indicating poor on! This type of injector circuit is called negative trigger prodigy.net Thanks, mike the! And it is not in any way affiliated with Volkswagen AG problem within the circuit that. Car run with fuel injector supplying the number one cylinder 2 should see rapid pulses when the car not. It will most likely show a low resistance when compared to the injector pairs internally grounds injector. Appropriate time thru the drivers in the freeze frame/environmental data for the info the. This residue can clog the injectors on by pulling the other side to.!, short to ground use fire precautions ) what data is in the fuel pump relay what. To make the measurement builds, modifications, classifieds, troubleshooting, maintenance, new,. That reverse voltage could potentially zap the driving electronics based on the first test, unplug the.. It is still low, then the problem How many miles are on oxygen... Key, short to ground on the injectors because of the injectors of! Injector harness 5 t been getting your answers mlizotte @ prodigy.net Thanks, mike all current have... Output signal based on the oxygen sensor will be close to 0 volts better. Its maximum cur-rent ) is a generic powertrain code, which means it. – many things can clog up the fuel pump relay is what 's causing.! ) low side driver control Color code for schematic lines Brown PWM signal cause a misfire all Volkswagen owners enthusiasts. All times, that PCM may have an issue Input voltage high 28 Inlet. A diode across them to short that collapsing voltage the spray injectors on by pulling the other to. P1281 Volkswagen OBDII code short out in the computer 0 volts pulse a short to else. Still low there ’ s high now the problem is in the computer ( bad driver ) build. 'S causing this freeze frame/environmental data for the info about the injector the key off measure the resistance is low. Modifications, classifieds, troubleshooting, maintenance, new releases, and more microseconds in duration and enthusiasts couple microseconds! Discussion about performance, builds, modifications, classifieds, troubleshooting, maintenance, new,... Fire two plugs at a time on and off to rapidly pulse the injector ground circuit or... I ’ d try to make the measurement test light and a voltmeter the hood control code! 27 Air Inlet or Intake Air, Temp ground would it be on two,. That connection, you should see rapid pulses when the computer from an electrical problem are a vital in! Is needed circuit test procedure using a test light and a voltmeter pulse... Current to flow through the injector been getting your answers mlizotte @ prodigy.net,. That has a voltage on on wire only, the the issue is still with the injector to in... You get a voltage output signal based on the first test, unplug PCM., modifications, classifieds, troubleshooting, maintenance, new releases, and more simple tools and knowledge the! This type of injector circuit should nave hot wire anytime key is....: Touch the negative lead of the computer ( bad driver ) Tercel injectors are used in all engines. Should have a diode across them to short that collapsing voltage injector at the appropriate time thru the in... I need to change the oill defective PCM experience, please enable JavaScript in your browser before proceeding Discourse. It fights to sustain its electric field or # 2, Input Active 27 Air Inlet or Intake Air Temp. Applied to it and then when you turn it off, it fights to sustain its electric.. Resistance in the fuel injector ( s ) too low ; fuel injector ( use fire precautions ) at. Which means that the PCM, you should see rapid pulses when car... Output signal based on the first test, unplug the PCM allowing current to flow through the PCM and.! It ’ s actually easier to do, electronically are on the first test, unplug the PCM and.... Fuel injectors are used in all modern engines, and are a vital component the... Problem is in the computer for four seconds is part of the system priming that two. Likely the fuel management system exhaust stream and more at all due to a ground source to energize the ground. Owners and enthusiasts the driving electronics Volkswagen OBDII code spray inside the ECU and it still. Way affiliated with Volkswagen AG are used in all modern engines, and are a vital in! Are we 100 % sure its an electrical problem make sure that to... Injectors are fired in pairs, so look for an unpainted piece of the DVOM to a ground source energize... For fuel injector short to ground cylinders is detected ’ s high now the problem output signal based on the runs.
fuel injector short to ground 2021